the Renewal of the Space Under the Bridge Based on Thermal Analysis -Taking the Bayi Bridge as an Example

With the advancement of global urbanization, under-bridge spaces in cities often become idle gray areas. In Donghu District, Nanchang, where Bayi Bridge is located, faced a severe aging problem, and the under-bridge space has become an important social and activity venue for surrounding elderly residents. This study conducts multidimensional research on the space under the Bayi Bridge through site analysis, questionnaire survey, ENVI-met microclimate simulation, and case references. The questionnaire survey shows that the elderly’s main needs focus on infrastructure such as seating and toilet, as well as activities like chess and light exercise, while the existing community elderly services are severely insufficient. Microclimate simulation indicates that the Physiological Equivalent Temperature (PET) in the shaded area under the bridge is stable at 30-40℃ with short heat stress duration, and the thermal comfort is significantly better than that of surrounding areas. Drawing on the experience of cases, this study proposes targeted design strategies: preserving existing shade trees, demolishing idle buildings, arranging core functional areas in low heat stress regions, improving high heat stress areas through waterscape and grove, constructing activity venues with lightweight camphorwood frame, and optimizing functional layout to meet the elderly’s needs for daily life, social interaction, and spiritual and cultural activities. This research provides a feasible plan for the aging-friendly renewal of urban under-bridge spaces.